linux-kernel - [PATCH] hwrng: omap

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Message-Id: <20190311105857.30792-1-r.czerwinski@pengutronix.de>
Date:   Mon, 11 Mar 2019 11:58:57 +0100
From:   Rouven Czerwinski <r.czerwinski@...gutronix.de>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     kernel@...gutronix.de,
        Rouven Czerwinski <r.czerwinski@...gutronix.de>,
        Deepak Saxena <dsaxena@...xity.net>,
        Matt Mackall <mpm@...enic.com>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] hwrng: omap - Set default quality

Newer combinations of the glibc, kernel and openssh can result in long initial
startup times on OMAP devices:

[    6.671425] systemd-rc-once[102]: Creating ED25519 key; this may take some time ...
[  142.652491] systemd-rc-once[102]: Creating ED25519 key; done.

due to the blocking getrandom(2) system call:

[  142.610335] random: crng init done

Set the quality level for the omap hwrng driver allowing the kernel to use the
hwrng as an entropy source at boot.

Signed-off-by: Rouven Czerwinski <r.czerwinski@...gutronix.de>
---
 drivers/char/hw_random/omap-rng.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/char/hw_random/omap-rng.c b/drivers/char/hw_random/omap-rng.c
index b65ff6962899..e9b6ac61fb7f 100644
--- a/drivers/char/hw_random/omap-rng.c
+++ b/drivers/char/hw_random/omap-rng.c
@@ -443,6 +443,7 @@ static int omap_rng_probe(struct platform_device *pdev)
 	priv->rng.read = omap_rng_do_read;
 	priv->rng.init = omap_rng_init;
 	priv->rng.cleanup = omap_rng_cleanup;
+	priv->rng.quality = 900;
 
 	priv->rng.priv = (unsigned long)priv;
 	platform_set_drvdata(pdev, priv);
-- 
2.21.0